App Service authentication disabled

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Metadata

Id: terraform-azure-app-service-authentication-disabled

Provider: Azure

Platform: Terraform

Severity: Medium

Category: Access Control

Learn More

Description

Azure App Service authentication settings should be enabled to ensure that access to the application is restricted to authenticated users. Without enabling the auth_settings { enabled = true } block in Terraform, anyone can anonymously access the app, which exposes it to unauthorized access and potential misuse of sensitive data or resources. Properly configuring authentication securely helps mitigate risks from attacks such as data exfiltration, account takeover, or service abuse.

auth_settings = {
  enabled = true
}

Compliant Code Examples

resource "azurerm_app_service" "negative1" {
  name                = "example-app-service"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  app_service_plan_id = azurerm_app_service_plan.example.id

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  auth_settings = {
    enabled = true
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }
}

resource "azurerm_windows_web_app" "negative2" {
  name                = "example-app-service-v2"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  service_plan_id     = azurerm_service_plan.example.id

  site_config {}

  auth_settings_v2 {
    auth_enabled = true

    login {}
  }
}

Non-Compliant Code Examples

resource "azurerm_app_service" "positive1" {
  name                = "example-app-service"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  app_service_plan_id = azurerm_app_service_plan.example.id

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }
}

resource "azurerm_app_service" "positive2" {
  name                = "example-app-service"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  app_service_plan_id = azurerm_app_service_plan.example.id

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  auth_settings = {
    enabled = false
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }
}